Need Help!! 1995 Mitsubishi-Galant 4dr. car 4 cyl. 2.4L SOHC?

My car just die running on the road, the other day. Before this major problem, the 4 cyl. engine would run very rough sometimes at times! Already check out electric fuel pump, spark plugs, cables, distributor cap-all check out good. When trying to start engine-I tested out for high voltage spark at a external spark plug-to check for spark-I can barely see the tiny spark in board daylight! Also when starting engine, the tiny sparks only last for about 2 seconds or so! Then I could no longer see anymore sparks, as I continuously crank up the engine! COULD THE PROBLEM BE IN THE ELECTRONIC DISTRIBUTOR??? Need help please!!! On a budget- cannot afford a mechanic at this time!!! Anyone owning Mitsubishi-Galant Cars!